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9.75x23.75x1 MERV 11 Pleated Air Filter

 

Actual Size: 9.75x23.75x0.75

$79.86$13.31/ea
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Superior
Superior

RESIDENTIAL AND/OR COMMERCIAL USE

Change Every 3 Months

Quantity

Top-Rated Filters. American Made. Delivered Free.

At Filterbuy, we don't cut corners—we craft high-quality air filters right here in the USA and ship them to your doorstep for free. No delays, no gimmicks—just clean air, made easy. With thousands of five-star reviews and filters built for real life & every HVAC system, it's no wonder why over 4 million families trust Filterbuy.

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Proudly Made In The USA

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All types of air filters from Filterbuy

Premium Materials That Go The Distance

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85,000+ 5-Star Reviews From Happy Customers

Stacked Filterbuy MERV-8 air filters

Save Up to 70% Per Filter with Packs

Things to Know About Filter Sizes

Finger pointing to nominal size

Nominal Size

  • The rounded size printed on your filter or HVAC unit (e.g., 9.75x23.75x1).
  • Usually whole numbers to make identifying and ordering easier.
  • A label for compatibility—not the exact measurement.
Finger pointing to actual size

Actual Size

  • The true, trimmed dimensions of the filter (e.g., 9.75x23.75x0.75 inches).
  • Filters are manufactured slightly smaller so they slide into the filter slot without forcing.
  • If you don't know your nominal size, measure your filter to get the actual size, then round up to find the nominal size to search on our site.
Help icon

Why the difference?

  • Nominal sizes simplify shopping and standardize categories.
  • Actual sizes ensure the filter fits properly inside your HVAC's filter rack.

How To Find Your Nominal Size When You Don't Know It

Air Filter Explaining Each Size
Nom 9.75"Act 9.75"
Nom 1"Act 0.75
Nom 23.75"Act 23.75"
1

Measure length × width × depth with a tape measure to find the actual size.

2

Round up each dimension to the nearest whole number to get the nominal size. Example: 9.75x23.75x0.75 in → 9.75x23.75x1 nominal.

3

Search by nominal size on our site for the best fit.

Help icon
Pro tips: If your filter is missing or damaged, measure the filter slot opening the same way.

Why Getting the Right Size Matters

  • Too small? Air can bypass the filter, reducing air quality and efficiency.
  • Too big? It won't fit—risking bent frames and airflow issues.
  • Just right? You get maximum performance, better filtration, and cleaner air.
Free Exchange Policy

Free Exchange Policy

If the filter you buy doesn't fit, we'll send you a better size.

Need a Non-Standard Size?

Need a Non-Standard Size?

Build a custom filter in just a few clicks.

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What's a MERV Rating?

MERV stands for Minimum Efficiency Reporting Value—but don't let the technical name fool you. It's just a way to rate how well an air filter traps stuff like dust, pollen, pet dander, and smoke. The higher the MERV number, the more particles it catches—and the cleaner your air will be.

Swipe To See More →
Dust & Debris
Dust Mites & Particles
Pollen
Mold
Lint
Dander
Smoke & Smog
Bacteria
Odors
MERV 8

MERV 8

Comparable to:FPR: 4-7MPR: 600-1000
MERV 11

MERV 11

Comparable to:FPR: 6-9MPR: 1200-1550
MERV 13

MERV 13

Comparable to:FPR: 10MPR: 1900-2800

What Makes Our Filters Last 90 Days? Quality, From the Inside Out

We build every Filterbuy filter to deliver reliable 90-day performance—thanks to smart design and premium materials that do the heavy lifting. Here's what makes the difference:

Pleated Design

More pleats = more surface area to capture dust and debris, keeping your air cleaner longer.

Electrostatically Charged Media

Pleats are magnetized to attract and trap microscopic particles—like pet dander, pollen, and smoke.

Synthetic Beverage Board Frame

Engineered to resist warping in extreme temperatures and high humidity.

Air Filter Wit Zoom In Key Features

Aluminum Dual Wire Backing

A layer of metal reinforcement keeps pleats evenly spaced and structurally sound—no sagging, even at high airflow.

Made in the USA

Assembled with care. Built to perform. Ships fast, free, and reliably from our U.S. facilities.

How to Install Your Filter in 4 Simple Steps

How to install your filter - Step 1 - return-vent

Turn Off Your HVAC SystemSafety first.

How to install your filter - Step 2 - return-vent

Remove The Old FilterLook for the airflow arrow and make note of the direction.

How to install your filter - Step 3 - return-vent

Slide In Your New FilterArrow should point toward the system (same direction as before).

How to install your filter - Step 4 - return-vent

Turn Your System Back OnAnd enjoy the fresh, clean air.

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Pleated Filters vs. Fiberglass—What's the Difference?

Not all air filters are created equal. Pleated filters don't just last longer—they actually clean your air better. Here's how they stack up:

Pleated Filter

Pleated Filters

Efficiency:

High (MERV 8–13) – Traps more particles

Lifespan:

90 days – Long-lasting performance

Air Quality:

Excellent – Cleaner, healthier air

Materials:

Recyclable and durable

Fiberglass Filter

Fiberglass Filters

Efficiency:

Low (MERV 4 or less) – Misses small stuff

Lifespan:

30 days or less – Replace often

Air Quality:

Minimal – Basic protection only

Materials:

Thin, flimsy, and not recyclable

Pleated filters are a no-brainer—more protection, less hassle, and better air for your home.

How Often Should You Change Your Filter?

Changing your filter on time keeps your HVAC system running efficiently—and helps protect your lungs from dust, allergens, and airborne irritants. Here's how often to swap it out based on your needs:

Calendar Illustration Every 90 days

Every 90 Days

Standard Schedule

For most homes without pets or special air quality concerns. Great for general upkeep and energy efficiency.

Calendar Illustration Every 60 days

Every 60 Days

If You Have Pets or Allergies

Shedding fur, dander, and allergy triggers can build up fast. Changing your filter every two months helps keep the air fresher and symptoms at bay.

Calendar Illustration Every 30 days

Every 30 Days

If You Have Respiratory Concerns or Live in Smog/Wildfire Zones

For households affected by smoke, pollution, or respiratory conditions, monthly changes ensure maximum protection.

Help icon
Final tip:
Want to stay on track? Set a reminder—or skip the stress with auto-delivery so fresh filters show up right when you need them.

Don't Just Take Our Word For It...

Got More Questions? We've Got Answers.

Product Specifications

Nominal Size9.75 x 23.75 x 1 inches
Actual Size9.75 x 23.75 x 0.75 inches
Filter TypePleated
MediaElectrostatically Charged
FrameBeverage Board
MERV Ratings Available8, 11, 13
LifespanUp to 90 Days
OriginMade in USA

Buy the Best 9.75x23.75x1 MERV 11 HVAC & Furnace Air Filters for Home from Filterbuy.com

Finding an exact-fit air filter like the 9.75x23.75x1 MERV 11 can be frustrating—we get it, because we’ve helped thousands of homeowners solve that same challenge. At Filterbuy.com, we manufacture each filter in-house to ensure consistent quality, precision sizing, and superior performance that generic brands simply can’t match. Backed by years of air filtration expertise, our MERV 11 filters are engineered to capture over 90% of common airborne irritants, improving indoor air quality while protecting your HVAC system—because we know clean air starts with a filter you can trust.

Top Takeaways

  • Exact 9.75x23.75x1 fit prevents air gaps.

  • MERV 11 captures 90%+ of airborne particles.

  • Backed by U.S. research and real-world results.

  • Adds less than 1% to HVAC energy use.

  • Made in the USA with fast, reliable shipping.

Why Choose Filterbuy’s 9.75x23.75x1 MERV 11 Air Filters?

When it comes to maintaining cleaner air and a more efficient HVAC system, choosing the right filter size and quality matters. Our 9.75x23.75x1 MERV 11 HVAC and furnace air filters are designed to capture over 90% of airborne particles—including dust, pollen, pet dander, mold spores, and smoke—without restricting airflow. This makes them ideal for households seeking a balance between high filtration performance and system efficiency.

At Filterbuy.com, every filter is proudly made in the USA using durable, industrial-grade materials and electrostatically charged synthetic media. We precision-cut each filter to exact dimensions, ensuring a snug fit that prevents bypass and maximizes performance. With fast shipping, convenient subscriptions, and dependable quality, Filterbuy helps you protect your indoor air and your HVAC investment with ease.

“After years of manufacturing custom-sized filters, we’ve seen how even a slight size mismatch can reduce HVAC efficiency and compromise indoor air quality. That’s why our 9.75x23.75x1 MERV 11 filters are cut to exact specs and built with premium media—to deliver reliable, high-performance filtration for homes that need more than a one-size-fits-all solution.”

📊 Why MERV 11 Filters Make Sense — Data + Experience

We’ve seen firsthand how the right filter improves air and HVAC performance. These stats back up what we know works:

1. Captures More Fine Particles

  • MERV 11 filters trap ~20% of particles sized 0.3–1 µm.

  • Includes dust, pet dander, mold spores, and smoke.

Source: epa.gov

2. Cost-Effective Air Quality Upgrade

  • Less than $1 per person/month to upgrade to MERV 11.

  • High-value performance for tight budgets.

Source: iaqscience.lbl.gov

3. Energy-Efficient Choice

  • <1% increase in HVAC energy use.

  • Strong filtration without overloading your system.

Source: eta-publications.lbl.gov

✅ Filterbuy’s take: These numbers match what we’ve seen across thousands of installations—cleaner air, low energy impact, and real value for homeowners.

Final Thought & Expert Opinion

Still unsure if this is the right filter for your home? Here’s our take, based on real experience and customer results:

Why It Stands Out

  • Exact fit: 9.75x23.75x1 filters that match your system without gaps.

  • Pro-level performance: MERV 11 captures over 90% of common pollutants.

  • Made to last: Durable, USA-made, with premium media and construction.

What We've Learned Firsthand

  • Many homeowners settle for "close-enough" filters that underperform.

  • MERV 11 filters offer strong protection without straining your HVAC.

  • Customers often report fewer allergy symptoms and cleaner vents after switching.

Our Opinion

  1. If you want cleaner air, longer HVAC life, and fewer filter worries, this is it.

  2. We've seen these filters improve indoor comfort in all types of homes.

  3. It's one of the most cost-effective upgrades you can make for your air quality.

✅ Bottom line: Trusted by thousands. Built with care. Backed by data—and experience.

View of Filterbuy’s MERV 11 HVAC air filters

Next Steps

Take these quick actions to start breathing cleaner air today:

1. Select Your Filters

  • Choose the 9.75x23.75x1 MERV 11 size.

  • Pick your quantity and delivery frequency (one-time or subscription).

2. Checkout Securely

  • Add to cart and complete your purchase at Filterbuy.com.

  • Enjoy fast shipping and USA-made quality.

3. Install Easily

4. Stay Updated

  • Subscribe to our newsletter.

  • Get filter change reminders, tips, and exclusive deals.

Frequently Asked Questions

1. What does a 9.75x23.75x1 MERV 11 air filter do?

This filter traps over 90% of common indoor pollutants like dust, pollen, mold spores, and pet dander—improving air quality without restricting airflow.

2. How often should I replace my 9.75x23.75x1 MERV 11 filter?

For best performance, replace every 2–3 months. Homes with pets, allergies, or high usage may benefit from monthly replacements.

3. Is MERV 11 too strong for residential HVAC systems?

No. MERV 11 offers an ideal balance—strong enough to catch fine particles, but still allows efficient airflow in most residential HVAC systems.

4. Why is the exact size 9.75x23.75x1 important?

Using the exact dimensions ensures a snug fit, prevents air from bypassing the filter, and keeps your HVAC system working efficiently.

5. Are Filterbuy’s MERV 11 filters made in the USA?

Yes! All our filters—including the 9.75x23.75x1 MERV 11—are proudly made in the USA with durable, high-quality materials.